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African Grey Hornbill
Immature birds are more uniformly grey.
Africa and the Arabian Peninsula
Tockus nasutus has 2 subspecies
Riverine bush, acacia woodland and savannah.
2-4 white eggs are laid in a tree hollow, which is blocked off during incubation with a cement made of mud, droppings and fruit pulp. There is only one narrow aperture, just big enough for the male to transfer food to the mother and the chicks. When the young and the female are too big to fit in the nest, the mother breaks out and rebuilds the wall, then both parents feed the young.
Though often unobtrusive they tend to call at sunrise producing a long sorrowful piping wail which varies in speed but often rises to a crescendo when the bird's head is thrown back as its whole body trembles with the effort.
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